Evaluation of Neutron Capture Gamma-ray Spectra for ^<89>Y, ^<93>Nb, ^<127>I, ^<133>Cs, ^<141>Pr, ^<197>Au, ^<nat>Tl, and ^<209>Bi

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概要

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• The neutron capture gamma-ray spectra for 8 nuclides, 89Y, 93Nb, 127I, 133Cs, 141Pr, 197Au, natTl, and 209Bi, were calculated by using the Hauser-Feshbach statistical model, and their results were compared with the available experimental data. Two dominant ingredients to perform the statistical calculation were the level densities described by the Gilbert-Cameron approach with an improved systematics, and the gamma-ray transmission coefficients described by gamma-ray strength functions. Although various gamma-ray strength functions with a Lorentzian formula have been developed by using the photonuclear data or a microscopic analysis, they have failed to reproduce the occasional anomalous bumps observed near or below a neutron binding. In this work, we could reproduce the bumps well by adding a Lorentzian with an energy-temperature dependent width into a giant electric dipole resonance with an enhanced generalized Lorentzian. In addition, we introduced a correction function so as to compensate for the shortcomings due to missing levels or level-cuts.

• 一般社団法人 日本原子力学会の論文
• 2007-08-25

著者

• LEE Young-Ouk

  Korea Atomic Energy Research Institute

• KIM Hyeong

  Korea Atomic Energy Research Institute

• YI Mi

  Korea Atomic Energy Research Institute

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• Establishing the Long-Term Fuel Management Scheme Using Point Reactivity Model.

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